test/nashorn/src/jdk/dynalink/test/DynamicLinkerFactoryTest.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package jdk.dynalink.test;

 import static jdk.dynalink.StandardNamespace.PROPERTY;
 import static jdk.dynalink.StandardOperation.GET;

 import java.lang.invoke.CallSite;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
 import java.util.List;
 import java.util.ServiceConfigurationError;
 import javax.script.ScriptEngine;
 import javax.script.ScriptEngineManager;
 import jdk.dynalink.CallSiteDescriptor;
 import jdk.dynalink.DynamicLinker;
 import jdk.dynalink.DynamicLinkerFactory;
 import jdk.dynalink.NoSuchDynamicMethodException;
 import jdk.dynalink.Operation;
 import jdk.dynalink.StandardNamespace;
 import jdk.dynalink.StandardOperation;
 import jdk.dynalink.beans.StaticClass;
 import jdk.dynalink.linker.GuardedInvocation;
 import jdk.dynalink.linker.GuardingDynamicLinker;
 import jdk.dynalink.linker.LinkRequest;
 import jdk.dynalink.linker.LinkerServices;
 import jdk.dynalink.support.SimpleRelinkableCallSite;
 import jdk.nashorn.api.scripting.AbstractJSObject;
 import org.testng.Assert;
 import org.testng.annotations.Test;

 @SuppressWarnings("javadoc")
 public class DynamicLinkerFactoryTest {

     private static final Operation GET_PROPERTY = GET.withNamespace(PROPERTY);

     private static DynamicLinkerFactory newDynamicLinkerFactory(final boolean resetClassLoader) {
         final DynamicLinkerFactory factory = new DynamicLinkerFactory();
         if (resetClassLoader) {
             factory.setClassLoader(null);
         }
         return factory;
     }

     @Test
     public void callSiteCreationTest() {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
         final DynamicLinker linker = factory.createLinker();
         final StandardOperation[] operations = StandardOperation.values();
         final MethodType mt = MethodType.methodType(Object.class, Object.class);
         for (final Operation op : operations) {
             final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
                     MethodHandles.publicLookup(), op, mt)));
             Assert.assertNotNull(cs);
             Assert.assertEquals(cs.type(), mt);
             Assert.assertNotNull(cs.getTarget());
         }
     }

     @Test
     public void fallbackLinkerTest() {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
         final Operation myOperation = new Operation() {
         };
         final boolean[] reachedFallback = { false };
         factory.setFallbackLinkers((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
             Assert.assertEquals(linkRequest.getCallSiteDescriptor().getOperation(), myOperation);
             reachedFallback[0] = true;
             return null;
         });

         final DynamicLinker linker = factory.createLinker();
         final MethodType mt = MethodType.methodType(Object.class);
         final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
                 MethodHandles.publicLookup(), myOperation, mt)));

         // linking the call site initially does not invoke the linkers!
         Assert.assertFalse(reachedFallback[0]);
         try {
             cs.getTarget().invoke();
         } catch (final NoSuchDynamicMethodException nsdm) {
             // we do expect NoSuchDynamicMethod!
             // because our dummy fallback linker returns null!
         } catch (final Throwable th) {
             throw new RuntimeException("should not reach here with: " + th);
         }

         // check that the control reached fallback linker!
         Assert.assertTrue(reachedFallback[0]);
     }

     @Test
     public void priorityLinkerTest() {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
         final Operation myOperation = new Operation() {
         };
         final boolean[] reachedProrityLinker = { false };
         factory.setPrioritizedLinker((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
             Assert.assertEquals(linkRequest.getCallSiteDescriptor().getOperation(), myOperation);
             reachedProrityLinker[0] = true;
             return null;
         });

         final DynamicLinker linker = factory.createLinker();
         final MethodType mt = MethodType.methodType(Object.class);
         final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
                 MethodHandles.publicLookup(), myOperation, mt)));

         // linking the call site initially does not invoke the linkers!
         Assert.assertFalse(reachedProrityLinker[0]);
         try {
             cs.getTarget().invoke();
         } catch (final NoSuchDynamicMethodException nsdm) {
             // we do expect NoSuchDynamicMethod!
             // because our dummy priority linker returns null!
         } catch (final Throwable th) {
             throw new RuntimeException("should not reach here with: " + th);
         }

         // check that the control reached fallback linker!
         Assert.assertTrue(reachedProrityLinker[0]);
     }

     @Test
     public void priorityAndFallbackLinkerTest() {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
         final Operation myOperation = new Operation() {
         };
         final int[] linkerReachCounter = { 0 };
         factory.setPrioritizedLinker((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
             Assert.assertEquals(linkRequest.getCallSiteDescriptor().getOperation(), myOperation);
             linkerReachCounter[0]++;
             return null;
         });
         factory.setFallbackLinkers((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
             Assert.assertEquals(linkRequest.getCallSiteDescriptor().getOperation(), myOperation);
             Assert.assertEquals(linkerReachCounter[0], 1);
             linkerReachCounter[0]++;
             return null;
         });

         final DynamicLinker linker = factory.createLinker();
         final MethodType mt = MethodType.methodType(Object.class);
         final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
                 MethodHandles.publicLookup(), myOperation, mt)));

         // linking the call site initially does not invoke the linkers!
         Assert.assertEquals(linkerReachCounter[0], 0);

         try {
             cs.getTarget().invoke();
         } catch (final NoSuchDynamicMethodException nsdm) {
             // we do expect NoSuchDynamicMethod!
         } catch (final Throwable th) {
             throw new RuntimeException("should not reach here with: " + th);
         }

         Assert.assertEquals(linkerReachCounter[0], 2);
     }

     @Test
     public void prelinkTransformerTest() throws Throwable {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
         final boolean[] reachedPrelinkTransformer = { false };

         factory.setPrelinkTransformer((final GuardedInvocation inv, final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
             reachedPrelinkTransformer[0] = true;
             // just identity transformer!
             return inv;
         });

         final MethodType mt = MethodType.methodType(Object.class, Object.class, String.class);
         final DynamicLinker linker = factory.createLinker();
         final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
                 MethodHandles.publicLookup(), GET_PROPERTY, mt)));
         Assert.assertFalse(reachedPrelinkTransformer[0]);
         Assert.assertEquals(cs.getTarget().invoke(new Object(), "class"), Object.class);
         Assert.assertTrue(reachedPrelinkTransformer[0]);
     }

     @Test
     public void internalObjectsFilterTest() throws Throwable {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
         final boolean[] reachedInternalObjectsFilter = { false };

         factory.setInternalObjectsFilter((final MethodHandle mh) -> {
             reachedInternalObjectsFilter[0] = true;
             return mh;
         });

         final MethodType mt = MethodType.methodType(Object.class, Object.class, String.class);
         final DynamicLinker linker = factory.createLinker();
         final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
                 MethodHandles.publicLookup(), GET_PROPERTY, mt)));
         Assert.assertFalse(reachedInternalObjectsFilter[0]);
         Assert.assertEquals(cs.getTarget().invoke(new Object(), "class"), Object.class);
         Assert.assertTrue(reachedInternalObjectsFilter[0]);
     }

     private static void checkOneAutoLoadingError(final DynamicLinkerFactory factory) {
         // expect one error as we have one untrusted linker exporter in META-INF/services
         final List<ServiceConfigurationError> autoLoadingErrors = factory.getAutoLoadingErrors();
         // single error ...
         Assert.assertFalse(autoLoadingErrors.isEmpty());
         final Throwable cause = autoLoadingErrors.get(0).getCause();
         // ..  due to permission check..
         Assert.assertTrue(cause.toString().contains("dynalink.exportLinkersAutomatically"));
     }

     @Test
     public void autoLoadedLinkerNegativeTest() {
         // enable auto loaded linkers
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(false);
         factory.createLinker();
         checkOneAutoLoadingError(factory);
     }

     @Test
     public void autoLoadedLinkerTest() {
         testAutoLoadedLinkerInvoked(new Object(), "toString");
     }

     @Test
     public void autoLoadedLinkerSeesStaticMethod() {
         testAutoLoadedLinkerInvoked(StaticClass.forClass(System.class), "currentTimeMillis");
     }

     private static void testAutoLoadedLinkerInvoked(final Object target, final String methodName) {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(false);
         final DynamicLinker linker = factory.createLinker();

         // we should still get one error due to untrusted dynamic linker exporter!
         checkOneAutoLoadingError(factory);

         final MethodType mt = MethodType.methodType(Object.class, Object.class);
         final CallSiteDescriptor testDescriptor = new CallSiteDescriptor(MethodHandles.publicLookup(),
                 GET.withNamespace(StandardNamespace.METHOD).named(methodName), mt);
         final CallSite cs = linker.link(new SimpleRelinkableCallSite(testDescriptor));

         TrustedGuardingDynamicLinkerExporter.enable();
         try {
             cs.getTarget().invoke(target);
             // The linker was loaded and it observed our invocation
             Assert.assertTrue(TrustedGuardingDynamicLinkerExporter.isLastCallSiteDescriptor(testDescriptor));
         } catch (final Throwable th) {
             throw new RuntimeException(th);
         } finally {
             TrustedGuardingDynamicLinkerExporter.disable();
         }

     }

     @Test
     public void nashornExportedLinkerJSObjectTest() {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(false);
         final DynamicLinker linker = factory.createLinker();

         final MethodType mt = MethodType.methodType(Object.class, Object.class);
         final Operation op = GET_PROPERTY.named("foo");
         final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
                 MethodHandles.publicLookup(), op, mt)));
         final boolean[] reachedGetMember = new boolean[1];
         // check that the nashorn exported linker can be used for user defined JSObject
         final Object obj = new AbstractJSObject() {
                 @Override
                 public Object getMember(final String name) {
                     reachedGetMember[0] = true;
                     return name.equals("foo")? "bar" : "<unknown>";
                 }
             };

         Object value = null;
         try {
             value = cs.getTarget().invoke(obj);
         } catch (final Throwable th) {
             throw new RuntimeException(th);
         }

         Assert.assertTrue(reachedGetMember[0]);
         Assert.assertEquals(value, "bar");
     }

     @Test
     public void nashornExportedLinkerScriptObjectMirrorTest() {
         final DynamicLinkerFactory factory = newDynamicLinkerFactory(false);
         final DynamicLinker linker = factory.createLinker();

         // check that the nashorn exported linker can be used for ScriptObjectMirror
         final ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
         final MethodType mt = MethodType.methodType(Object.class, Object.class);
         final Operation op = GET_PROPERTY.named("foo");
         final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
                 MethodHandles.publicLookup(), op, mt)));
         Object value = null;
         try {
             final Object obj = engine.eval("({ foo: 'hello' })");
             value = cs.getTarget().invoke(obj);
         } catch (final Throwable th) {
             throw new RuntimeException(th);
         }
         Assert.assertEquals(value, "hello");
     }
 }
	/*
	* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	package jdk.dynalink.test;

	import static jdk.dynalink.StandardNamespace.PROPERTY;
	import static jdk.dynalink.StandardOperation.GET;

	import java.lang.invoke.CallSite;
	import java.lang.invoke.MethodHandle;
	import java.lang.invoke.MethodHandles;
	import java.lang.invoke.MethodType;
	import java.util.List;
	import java.util.ServiceConfigurationError;
	import javax.script.ScriptEngine;
	import javax.script.ScriptEngineManager;
	import jdk.dynalink.CallSiteDescriptor;
	import jdk.dynalink.DynamicLinker;
	import jdk.dynalink.DynamicLinkerFactory;
	import jdk.dynalink.NoSuchDynamicMethodException;
	import jdk.dynalink.Operation;
	import jdk.dynalink.StandardNamespace;
	import jdk.dynalink.StandardOperation;
	import jdk.dynalink.beans.StaticClass;
	import jdk.dynalink.linker.GuardedInvocation;
	import jdk.dynalink.linker.GuardingDynamicLinker;
	import jdk.dynalink.linker.LinkRequest;
	import jdk.dynalink.linker.LinkerServices;
	import jdk.dynalink.support.SimpleRelinkableCallSite;
	import jdk.nashorn.api.scripting.AbstractJSObject;
	import org.testng.Assert;
	import org.testng.annotations.Test;

	@SuppressWarnings("javadoc")
	public class DynamicLinkerFactoryTest {

	private static final Operation GET_PROPERTY = GET.withNamespace(PROPERTY);

	private static DynamicLinkerFactory newDynamicLinkerFactory(final boolean resetClassLoader) {
	final DynamicLinkerFactory factory = new DynamicLinkerFactory();
	if (resetClassLoader) {
	factory.setClassLoader(null);
	}
	return factory;
	}

	@Test
	public void callSiteCreationTest() {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
	final DynamicLinker linker = factory.createLinker();
	final StandardOperation[] operations = StandardOperation.values();
	final MethodType mt = MethodType.methodType(Object.class, Object.class);
	for (final Operation op : operations) {
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
	MethodHandles.publicLookup(), op, mt)));
	Assert.assertNotNull(cs);
	Assert.assertEquals(cs.type(), mt);
	Assert.assertNotNull(cs.getTarget());
	}
	}

	@Test
	public void fallbackLinkerTest() {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
	final Operation myOperation = new Operation() {
	};
	final boolean[] reachedFallback = { false };
	factory.setFallbackLinkers((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
	Assert.assertEquals(linkRequest.getCallSiteDescriptor().getOperation(), myOperation);
	reachedFallback[0] = true;
	return null;
	});

	final DynamicLinker linker = factory.createLinker();
	final MethodType mt = MethodType.methodType(Object.class);
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
	MethodHandles.publicLookup(), myOperation, mt)));

	// linking the call site initially does not invoke the linkers!
	Assert.assertFalse(reachedFallback[0]);
	try {
	cs.getTarget().invoke();
	} catch (final NoSuchDynamicMethodException nsdm) {
	// we do expect NoSuchDynamicMethod!
	// because our dummy fallback linker returns null!
	} catch (final Throwable th) {
	throw new RuntimeException("should not reach here with: " + th);
	}

	// check that the control reached fallback linker!
	Assert.assertTrue(reachedFallback[0]);
	}

	@Test
	public void priorityLinkerTest() {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
	final Operation myOperation = new Operation() {
	};
	final boolean[] reachedProrityLinker = { false };
	factory.setPrioritizedLinker((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
	Assert.assertEquals(linkRequest.getCallSiteDescriptor().getOperation(), myOperation);
	reachedProrityLinker[0] = true;
	return null;
	});

	final DynamicLinker linker = factory.createLinker();
	final MethodType mt = MethodType.methodType(Object.class);
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
	MethodHandles.publicLookup(), myOperation, mt)));

	// linking the call site initially does not invoke the linkers!
	Assert.assertFalse(reachedProrityLinker[0]);
	try {
	cs.getTarget().invoke();
	} catch (final NoSuchDynamicMethodException nsdm) {
	// we do expect NoSuchDynamicMethod!
	// because our dummy priority linker returns null!
	} catch (final Throwable th) {
	throw new RuntimeException("should not reach here with: " + th);
	}

	// check that the control reached fallback linker!
	Assert.assertTrue(reachedProrityLinker[0]);
	}

	@Test
	public void priorityAndFallbackLinkerTest() {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
	final Operation myOperation = new Operation() {
	};
	final int[] linkerReachCounter = { 0 };
	factory.setPrioritizedLinker((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
	Assert.assertEquals(linkRequest.getCallSiteDescriptor().getOperation(), myOperation);
	linkerReachCounter[0]++;
	return null;
	});
	factory.setFallbackLinkers((GuardingDynamicLinker) (final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
	Assert.assertEquals(linkRequest.getCallSiteDescriptor().getOperation(), myOperation);
	Assert.assertEquals(linkerReachCounter[0], 1);
	linkerReachCounter[0]++;
	return null;
	});

	final DynamicLinker linker = factory.createLinker();
	final MethodType mt = MethodType.methodType(Object.class);
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
	MethodHandles.publicLookup(), myOperation, mt)));

	// linking the call site initially does not invoke the linkers!
	Assert.assertEquals(linkerReachCounter[0], 0);

	try {
	cs.getTarget().invoke();
	} catch (final NoSuchDynamicMethodException nsdm) {
	// we do expect NoSuchDynamicMethod!
	} catch (final Throwable th) {
	throw new RuntimeException("should not reach here with: " + th);
	}

	Assert.assertEquals(linkerReachCounter[0], 2);
	}

	@Test
	public void prelinkTransformerTest() throws Throwable {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
	final boolean[] reachedPrelinkTransformer = { false };

	factory.setPrelinkTransformer((final GuardedInvocation inv, final LinkRequest linkRequest, final LinkerServices linkerServices) -> {
	reachedPrelinkTransformer[0] = true;
	// just identity transformer!
	return inv;
	});

	final MethodType mt = MethodType.methodType(Object.class, Object.class, String.class);
	final DynamicLinker linker = factory.createLinker();
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
	MethodHandles.publicLookup(), GET_PROPERTY, mt)));
	Assert.assertFalse(reachedPrelinkTransformer[0]);
	Assert.assertEquals(cs.getTarget().invoke(new Object(), "class"), Object.class);
	Assert.assertTrue(reachedPrelinkTransformer[0]);
	}

	@Test
	public void internalObjectsFilterTest() throws Throwable {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(true);
	final boolean[] reachedInternalObjectsFilter = { false };

	factory.setInternalObjectsFilter((final MethodHandle mh) -> {
	reachedInternalObjectsFilter[0] = true;
	return mh;
	});

	final MethodType mt = MethodType.methodType(Object.class, Object.class, String.class);
	final DynamicLinker linker = factory.createLinker();
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
	MethodHandles.publicLookup(), GET_PROPERTY, mt)));
	Assert.assertFalse(reachedInternalObjectsFilter[0]);
	Assert.assertEquals(cs.getTarget().invoke(new Object(), "class"), Object.class);
	Assert.assertTrue(reachedInternalObjectsFilter[0]);
	}

	private static void checkOneAutoLoadingError(final DynamicLinkerFactory factory) {
	// expect one error as we have one untrusted linker exporter in META-INF/services
	final List<ServiceConfigurationError> autoLoadingErrors = factory.getAutoLoadingErrors();
	// single error ...
	Assert.assertFalse(autoLoadingErrors.isEmpty());
	final Throwable cause = autoLoadingErrors.get(0).getCause();
	// .. due to permission check..
	Assert.assertTrue(cause.toString().contains("dynalink.exportLinkersAutomatically"));
	}

	@Test
	public void autoLoadedLinkerNegativeTest() {
	// enable auto loaded linkers
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(false);
	factory.createLinker();
	checkOneAutoLoadingError(factory);
	}

	@Test
	public void autoLoadedLinkerTest() {
	testAutoLoadedLinkerInvoked(new Object(), "toString");
	}

	@Test
	public void autoLoadedLinkerSeesStaticMethod() {
	testAutoLoadedLinkerInvoked(StaticClass.forClass(System.class), "currentTimeMillis");
	}

	private static void testAutoLoadedLinkerInvoked(final Object target, final String methodName) {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(false);
	final DynamicLinker linker = factory.createLinker();

	// we should still get one error due to untrusted dynamic linker exporter!
	checkOneAutoLoadingError(factory);

	final MethodType mt = MethodType.methodType(Object.class, Object.class);
	final CallSiteDescriptor testDescriptor = new CallSiteDescriptor(MethodHandles.publicLookup(),
	GET.withNamespace(StandardNamespace.METHOD).named(methodName), mt);
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(testDescriptor));

	TrustedGuardingDynamicLinkerExporter.enable();
	try {
	cs.getTarget().invoke(target);
	// The linker was loaded and it observed our invocation
	Assert.assertTrue(TrustedGuardingDynamicLinkerExporter.isLastCallSiteDescriptor(testDescriptor));
	} catch (final Throwable th) {
	throw new RuntimeException(th);
	} finally {
	TrustedGuardingDynamicLinkerExporter.disable();
	}

	}

	@Test
	public void nashornExportedLinkerJSObjectTest() {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(false);
	final DynamicLinker linker = factory.createLinker();

	final MethodType mt = MethodType.methodType(Object.class, Object.class);
	final Operation op = GET_PROPERTY.named("foo");
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
	MethodHandles.publicLookup(), op, mt)));
	final boolean[] reachedGetMember = new boolean[1];
	// check that the nashorn exported linker can be used for user defined JSObject
	final Object obj = new AbstractJSObject() {
	@Override
	public Object getMember(final String name) {
	reachedGetMember[0] = true;
	return name.equals("foo")? "bar" : "<unknown>";
	}
	};

	Object value = null;
	try {
	value = cs.getTarget().invoke(obj);
	} catch (final Throwable th) {
	throw new RuntimeException(th);
	}

	Assert.assertTrue(reachedGetMember[0]);
	Assert.assertEquals(value, "bar");
	}

	@Test
	public void nashornExportedLinkerScriptObjectMirrorTest() {
	final DynamicLinkerFactory factory = newDynamicLinkerFactory(false);
	final DynamicLinker linker = factory.createLinker();

	// check that the nashorn exported linker can be used for ScriptObjectMirror
	final ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
	final MethodType mt = MethodType.methodType(Object.class, Object.class);
	final Operation op = GET_PROPERTY.named("foo");
	final CallSite cs = linker.link(new SimpleRelinkableCallSite(new CallSiteDescriptor(
	MethodHandles.publicLookup(), op, mt)));
	Object value = null;
	try {
	final Object obj = engine.eval("({ foo: 'hello' })");
	value = cs.getTarget().invoke(obj);
	} catch (final Throwable th) {
	throw new RuntimeException(th);
	}
	Assert.assertEquals(value, "hello");
	}
	}